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Larger displacement Atkinson cycle engines may be in the future for Toyota

A number of automotive manufacturers have begun to move away from larger displacement naturally aspirated engines to smaller displacement turbocharged engines. The general idea was that smaller and lighter engines would use less fuel while offering the same sort of performance thanks to the addition of a turbocharger. However, in the real world many drivers have discovered that turbocharged small displacement engines are often unable to deliver on their fuel efficiency claims.

Toyota is considering bucking the industry trend and rather than going with smaller turbocharged engines, is considering larger naturally aspirated engines to improve fuel efficiency. Senior managing officer in charge of drivetrain R&D for Toyota Koei Saga recently said that Toyota believes gasoline engines could benefit more from upsizing capacity in conjunction with Atkinson combustion cycles than going smaller with turbochargers.
 
Atkinson engines today are typically only used in hybrid vehicles like the Prius, Ford Fusion Hybrid, Hyundai Sonata Hybrid, and Honda Accord Hybrid.


Toyota Camry
 
Increasing the displacement of an engine using the Atkinson cycle would deliver a specific output less than that of similarly sized conventional combustion cycle engines, but fuel economy would be better. Toyota believes that fuel economy would be better than the smaller engines they replace.
 
Toyota has offered no timeframe for bringing larger displacement Atkinson cycle engines to market and hasn't hinted at which models might get the Atkinson cycle engines.
 
Mazda experimented with similar “delayed valve” Miller Cycle technology over a decade ago in the Millenia midsize sedan. But instead of using electric motors to make up for the reduced power density like today’s Atkinson-engine hybrid vehicles, the Millenia used a supercharger.
 
Saga also talked a bit about the next generation Toyota Prius saying that the vehicle will use a mixture of battery technology including lithium-ion and nickel batteries. The reason for mixing battery types is that lithium-ion batteries are better for performance, but the durability and lifespan is better for nickel batteries. 

Source: Green Car Reports



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RE: According to whom?
By cruisin3style on 10/16/2013 8:12:13 PM , Rating: 3
FIT is right, people rating him down just don't know how to drive other than: "if i'm not on the g0dd4mn brake, i'm on the f#@king gas b!tch!"

it is because most people drive automatics, and may never have touched a stick in their life. you can decelerate by letting off the gas! you don't have to speed up until you have to brake!

one thing i see all the time that is a total waste of gas is people accelerating towards a red light, and none of the lanes are empty (in case the red light turns green before they get to it and they can then just cruise through). People even pass me when i'm engine braking toward a red light, even though the red light is coming up very soon, and like i said there is nowhere to go.

i picked up a used mazdaspeed3 recently that is rated something like 18 city/25 highway but 25 is the worst i've gotten and low 30s is the highest. and i do plenty of city driving, at least 1/3 of my driving is city, and i do not drive like an old lady.

you just have to know how not to drive like a cock.


RE: According to whom?
By Spuke on 10/17/2013 3:58:57 PM , Rating: 2
quote:
one thing i see all the time that is a total waste of gas is people accelerating towards a red light
I thought I was the only one that noticed that. I see this crap ALL of the time. And what's up with the continuous acceleration between two points? There's a long stretch of road on my commute that starts at a stop sign and goes past a freeway entrance (about 6 miles). Most people turn onto the freeway. At LEAST 90% of the people I follow on this stretch accelerate the ENTIRE section, hitting their fastest speed on the last 1/3, then slow for the onramp. WTF is that?! No wonder most people can't match EPA mpg ratings.


RE: According to whom?
By Philippine Mango on 10/17/2013 6:49:33 PM , Rating: 2
Yeah I drive a 2007 ES350 and I average 26-28mpg with 50-50 city highway driving but then again I'm pretty light on the throttle and I try to get into the highest gear as quickly as possible and maintain speeds that keep the car in a higher gear with the torque converter locked up.


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